Truck a and truck b move grain into a box at the rate of 20 kilos/ min and 13 1/3 kilos a minute respectively while truck c removes grain from the box at the rate of 10 kilos/ min. If the capacity of the box is 2.4 tons, and truck a, truck b and truck c are working simultaneously then the box will be filled in
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Explanation:
Total input of grain = 20+13/3= 24.3kg/min
Output = 10kg/min
Net gain per minute = 14.3kg/min
Time needed to fill 2.4 tons= 2.4×10^3kg / 14.3
= 0.16× 10^3
= 160min
= 2hr .40min
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